Distributed phase modifier configuration method and device based on voltage stiffness index

Abstract

The invention relates to the technical field of power supplies, and discloses a distributed phase modifier configuration method and device based on a voltage stiffness index, which are applied to a new energy field station comprising a plurality of input branches, and the method comprises the following steps: determining respective target voltage stiffness of each input branch, the voltage stiffness being used for representing a voltage support degree; determining the target capacity and the target number of the distributed phase modifier arranged in each input branch according to the target voltage stiffness, and obtaining the station capacity and the station number according to the sum of the target capacity and the target number of each input branch; and configuring the distributed phase modifier of the new energy station based on the station capacity and the station number so as to configure the distributed phase modifier according to the target voltage support degree. According to the method, the problems that the actual supporting effect of the distributed phase modifier cannot be accurately evaluated and the distributed phase modifier configuration number and capacity better matched with the actual demand cannot be obtained due to the fact that an existing distributed phase modifier configuration technology and index lack phase angle information are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a distributed phase regulator configuration method and device based on voltage stiffness index. Background Art

[0002] In order to improve the voltage support capacity of the sending-end DC converter station and suppress the transient overvoltage of the sending-end DC system under transient fault conditions, the measures usually taken at this stage are to configure a large-capacity centralized phase-shifting machine at the AC busbar feeding the vicinity of the sending-end 500kV or 750kV DC converter station.

[0003] However, although centralized phase regulators can effectively suppress overvoltages in connected stations or converter stations, it is difficult to have a significant effect on overvoltage suppression in medium-voltage or low-voltage renewable energy stations with longer electrical distances. Distributed phase regulators can be used as an effective technology to suppress overvoltage problems in medium-voltage or low-voltage renewable energy stations. However, the current technology and indicators for evaluating the voltage support effect of distributed phase regulators lack phase angle information of related equipment, resulting in a certain deviation between the evaluation results and the actual effect, making it difficult to obtain the number and capacity of distributed phase regulators that better match actual needs. Summary of the invention

[0004] In view of this, the present invention provides a distributed phase condenser configuration method and device based on voltage stiffness index to solve the problem that the existing distributed phase condenser configuration technology and indicators lack phase angle information of related equipment, resulting in the inability to accurately evaluate the actual supporting effect of the phase condenser and the inability to obtain the distributed phase condenser configuration quantity and capacity that better matches the actual needs.

[0005] In a first aspect, the present invention provides a distributed phase-shifting configuration method based on a voltage stiffness index. The distributed phase-shifting configuration method based on a voltage stiffness index is applied to a new energy station including a plurality of input branches. The method comprises:

[0006] Determine the target voltage stiffness of each input branch, where voltage stiffness is used to indicate the degree of voltage support;

[0007] Determine the target capacity and target number of distributed phase regulators set in each input branch according to the target voltage stiffness, and obtain the station capacity and station number according to the sum of the target capacity and target number of each input branch;

[0008] Distributed phase regulators are configured for new energy stations based on the station capacity and the number of stations, so as to configure the distributed phase regulators according to the target voltage support level.

[0009] The distributed phase regulator configuration method based on voltage stiffness index provided in this embodiment takes the target voltage stiffness of each input branch in the new energy station as an index, obtains the target capacity and target number of distributed phase regulators that need to be set in each input branch, obtains the station capacity and the number of stations according to the sum of the target capacity and the target number of each input branch, and configures the distributed phase regulators according to the station capacity and the number of stations, so that the supporting voltage of the new energy station can meet the overvoltage situation, thereby achieving a significant overvoltage suppression effect.

[0010] In an optional implementation, the step of confirming the target capacity and target number of distributed phase regulators provided in each input branch according to the target voltage stiffness includes:

[0011] Confirm the initial capacity and initial number of distributed phase regulators set in each input branch;

[0012] The initial capacity and the initial quantity are used as the current capacity and the current quantity, the current voltage stiffness of the current capacity and the current quantity is calculated, and the current capacity and the current quantity are iteratively updated according to the current voltage stiffness and the target voltage stiffness until the current voltage stiffness of each input branch meets its respective target voltage stiffness, and the target capacity and target quantity of each input branch are obtained, wherein the difference between the updated voltage stiffness corresponding to the target capacity and the target quantity and the target voltage stiffness is less than a preset difference threshold.

[0013] In an optional implementation, the step of iteratively updating the current capacity and the current quantity according to the current voltage stiffness and the target voltage stiffness includes:

[0014] Calculate the total capacity of all input branches in the new energy station, and calculate the current voltage stiffness under the current capacity and current number;

[0015] A capacity adjustment value is obtained according to the target voltage stiffness, the total capacity, the current capacity, the current quantity and the current voltage stiffness;

[0016] Update and adjust the current capacity and current quantity according to the capacity adjustment value.

[0017] In an optional implementation, the input branch includes: an input branch to be measured and other input branches, and the step of calculating the current voltage stiffness under the current capacity and the current number includes:

[0018] Under the current capacity and current quantity, the self-impedance vectors of the remaining input branches, the grid-connected equipment impedance vectors of the input branch to be measured, the grid-connected equipment impedance vectors of the remaining input branches and the grid impedance vector are calculated respectively by using the Thevenin equivalent circuit conversion formula;

[0019] The current voltage stiffness is calculated according to the self-impedance vectors of the remaining input branches, the grid-connected equipment impedance vectors of the input branch to be measured, the grid-connected equipment impedance vectors of the remaining input branches and the grid impedance vector.

[0020] In an optional implementation, the step of calculating the current voltage stiffness under the current capacity and the current quantity includes:

[0021] Based on the electromagnetic transient simulation model of the new energy station, the transient voltage of the AC bus with multiple DC feeds and the no-load voltage of the AC bus with multiple DC feeds under the current capacity and current number are obtained;

[0022] The current voltage stiffness is obtained based on the ratio of the AC bus voltage with multiple DC feeds to the no-load voltage of the AC bus with multiple DC feeds.

[0023] In an optional embodiment, the method further includes:

[0024] If the current voltage stiffness is lower than the target voltage stiffness, increase the current capacity and / or current quantity;

[0025] If the current voltage stiffness is higher than the target voltage stiffness, reduce the current capacity and / or current quantity.

[0026] In an optional implementation, the step of confirming the target voltage stiffness of each input branch includes:

[0027] Determine the target voltage stiffness based on the actual voltage support requirements of each input branch; and / or,

[0028] The target voltage stiffness is confirmed according to the voltage tolerance of each input branch.

[0029] In a second aspect, the present invention provides a distributed phase-shifting configuration device based on a voltage stiffness index, the device comprising:

[0030] A first confirmation module is used to confirm the target voltage stiffness of each input branch, wherein the voltage stiffness is used to indicate the voltage support degree;

[0031] The second confirmation module is used to confirm the target capacity and target number of distributed phase regulators set in each input branch according to the target voltage stiffness, and obtain the station capacity and station number according to the sum of the target capacity and target number of each input branch;

[0032] The configuration module is used to configure the distributed phase regulators of the new energy stations based on the station capacity and the number of stations, so as to configure the distributed phase regulators according to the target voltage support degree.

[0033] In a third aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to execute the distributed phase-shifting phase configuration method based on the voltage stiffness index of the above-mentioned first aspect or any corresponding embodiment thereof.

[0034] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the distributed phase-shifting phase configuration method based on the voltage stiffness index of the above-mentioned first aspect or any corresponding embodiment thereof.

[0035] In a fifth aspect, the present invention provides a computer program product, comprising computer instructions for causing a computer to execute the distributed phase-shifting phase configuration method based on the voltage stiffness index of the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a structural diagram of a centralized phase regulator;

[0038] Figure 2 is a flow chart of a distributed phase condenser configuration method based on voltage stiffness index according to an embodiment of the present invention;

[0039] Figure 3 is an application schematic diagram of a distributed phase condenser configuration method based on voltage stiffness index according to an embodiment of the present invention;

[0040] Figure 4 is another application schematic diagram of a distributed phase condenser configuration method based on a voltage stiffness index according to an embodiment of the present invention;

[0041] Figure 5 is another flow chart of a distributed phase condenser configuration method based on voltage stiffness index according to an embodiment of the present invention;

[0042] Figure 6 is a structural block diagram of a distributed phase regulator configuration device based on voltage stiffness index according to an embodiment of the present invention;

[0043] Figure 7It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0045] In the related technology, in order to improve the voltage support capacity of the sending-end DC converter station and suppress the transient overvoltage of the sending-end DC system under transient fault conditions, the measures usually taken at this stage are to configure a large-capacity centralized phase regulator at the AC bus of the 500kV or 750kV high-voltage collection station that feeds the sending-end DC converter station. Figure 1 In the prior art, only one centralized phase regulator is set at the collection station of all stations. However, although the centralized phase regulator can effectively suppress the overvoltage of the connected station or converter station, it is difficult to have a significant effect on the overvoltage suppression of medium-voltage or low-voltage new energy stations with a longer electrical distance. Distributed phase regulators can be used as an effective technology to suppress overvoltage problems in medium-voltage or low-voltage new energy stations. However, the current technology and indicators for evaluating the voltage support effect of distributed phase regulators lack the phase angle information of related equipment, resulting in a certain deviation between the evaluation results and the actual effect, making it difficult to obtain the number and capacity of distributed phase regulators that better match actual needs.

[0046] According to an embodiment of the present invention, an embodiment of a distributed phase-shifting device configuration method based on a voltage stiffness index is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0047] In this embodiment, a distributed phase regulator configuration method based on voltage stiffness index is provided, which can be used for the above-mentioned mobile terminals, such as mobile phones, tablet computers, etc. Figure 2 is a flow chart of a distributed phase condenser configuration method based on voltage stiffness index according to an embodiment of the present invention, such as Figure 2 As shown in the figure, the distributed phase-converter configuration method based on voltage stiffness index is applied to a new energy station including multiple input branches. The process includes the following steps:

[0048] Step S101 : confirming the target voltage stiffness of each input branch, wherein the voltage stiffness is used to indicate the voltage support degree.

[0049] refer to Figure 3 , distributed phase regulators are phase regulators of a certain capacity configured in medium-voltage or low-voltage new energy stations in different regions to achieve effective reactive power compensation and voltage support for the new energy stations. The new energy station includes multiple input branches, which can be power generation branches of wind farms and / or power generation branches of photovoltaic stations. One or more distributed phase regulators can be set in each input branch, and of course, no distributed phase regulators can be set. The grid-connected device is a grid-connected converter. Multiple input branches represent multiple DC feeds into the new energy station.

[0050] Specifically, the voltage stiffness is specifically expressed by the ratio of the AC bus voltage at the outlet of the new energy station to the no-load voltage. The voltage parameters comprehensively include the amplitude and phase information of the equivalent impedance of the grid-connected equipment and the grid equipment, and more accurately characterize the overvoltage suppression and voltage support strength effects under the working conditions of multiple DC-fed new energy stations. The multiple input branches are the first input branch, the second input branch...the i-th input branch. The target voltage stiffness of each input branch in the new energy station is calculated, which are the first target voltage stiffness, the second target voltage stiffness...the i-th target voltage stiffness. Optionally, the target voltage stiffness is specifically a value set by the user based on actual conditions.

[0051] Step S102, confirming the target capacity and target number of distributed phase regulators set in each input branch according to the target voltage stiffness, and obtaining the station capacity and the station number according to the sum of the target capacity and the target number of each input branch;

[0052] Specifically, the target capacity and target number of distributed phase regulators set in each input branch are calculated according to all target voltage stiffnesses. The target capacity can be the unit capacity of a phase regulator. Therefore, the target number can vary according to the unit capacity of the distributed phase regulator. The product of the target capacity and the target number is the capacity to be configured of the input branch. Of course, the capacity of the distributed phase regulator set in each input branch can be confirmed only according to the target voltage stiffness, and the target capacity and target number can be set according to the capacity to be configured in each input branch. At this time, the distributed phase regulator of the new energy station is the optimal configuration capacity.

[0053] Optionally, the target capacity and the target quantity may be obtained according to a preset calculation model, which calculates and finds the target capacity and the target quantity of each input branch whose actual voltage stiffness of each input branch satisfies the respective target voltage stiffness threshold. The target voltage stiffness threshold may be a value within a preset range of the target voltage stiffness. The capacity and the quantity of the distributed phase regulator are correlated with the actual voltage stiffness.

[0054] Step S103, configuring the distributed phase regulator of each input branch based on the station capacity and the number of stations, so as to configure the distributed phase regulator according to the target voltage support degree.

[0055] Specifically, one or more distributed phase regulators can be set in each input branch, so one or more distributed phase regulators can be set in the new energy station. Distributed phase regulators of different numbers and unit capacities are set according to the different total capacities in the new energy station.

[0056] Of course, the configuration method of distributed phase regulators can also be applied to centralized phase regulators at collection stations, and multiple input branches can be for various new energy stations.

[0057] The configuration method of distributed phase regulators based on voltage stiffness index provided in this embodiment takes the target voltage stiffness of each input branch in the new energy station as an index, obtains the target capacity and target number of distributed phase regulators that need to be set in each input branch, obtains the station capacity and the number of stations according to the sum of the target capacity and the target number of each input branch, and configures the distributed phase regulators according to the station capacity and the number of stations, so that the supporting voltage of the new energy station can meet the overvoltage situation, thereby achieving a significant overvoltage suppression effect.

[0058] In some optional implementations, step S102 includes:

[0059] Step 1: confirm the initial capacity and initial number of distributed phase regulators set in each input branch;

[0060] Specifically, an initial capacity and an initial quantity are roughly set according to the actual situation in the new energy station. Of course, each initial capacity and initial quantity can be set to a uniform value.

[0061] Step 2: Take the initial capacity and initial quantity as the current capacity and current quantity, calculate the current voltage stiffness of the current capacity and current quantity, iteratively update the current capacity and current quantity according to the current voltage stiffness and the target voltage stiffness, until the current voltage stiffness of each input branch meets its respective target voltage stiffness, and obtain the target capacity and target quantity of each input branch, wherein the difference between the updated voltage stiffness corresponding to the target capacity and target quantity and the target voltage stiffness is less than a preset difference threshold.

[0062] Specifically, under the configuration of the initial capacity and the initial number of distributed phase regulators, the voltage stiffness of each input branch is calculated, and each voltage stiffness is adjusted according to the preset adjustment unit value. It is worth noting that when the current capacity and the current number of one of the input branches are adjusted, the current capacity and the current number of the remaining input branches may change accordingly. Therefore, in one round of iterative updates, the current capacity and the current number of each input branch are adjusted respectively, and then the next round of iterative updates is performed. Finally, the target capacity and the target number are obtained in each input branch, and the difference between the updated voltage stiffness and the target voltage stiffness is less than the preset difference threshold. represents the voltage stiffness of the i-th input branch after the h-th round of update, represents the target voltage stiffness of the i-th input branch, and ε represents the preset difference threshold. The difference between the updated voltage stiffness and the target voltage stiffness may be an absolute value, and m represents multiple input branches.

[0063] In some optional implementations, the step of “iteratively updating the current capacity and the current quantity according to the current voltage stiffness and the target voltage stiffness” in step 2 includes:

[0064] Step (1): Calculate the total capacity of all input branches in the new energy station;

[0065] Specifically, Q Ci0 Represents the initial capacity of a single distributed phase regulator of the i-th input branch, where i = 1, 2, 3, ..., M, that is, the number of input branches of the new energy station is M. N i0 represents the initial quantity, Q Ci0 N i0 represents the initial total capacity of the i-th input branch, Q CT It represents the total capacity of the distributed phase-shifting machine in the new energy station, and h represents the hth round of regulation.

[0066] Step (2): obtaining a capacity adjustment value according to the target voltage stiffness, the total capacity, the current capacity, the current quantity and the current voltage stiffness;

[0067] Specifically, ΔQ Ci，(h+1) represents the capacity adjustment value of the h+1th round, represents the target voltage stiffness of the ith input branch, Q Ci，(h) represents the distributed phase regulator capacity of the i-th input branch after the h-th round of regulation, that is, the current capacity, N Ci，(h) represents the number of distributed phase regulators in the i-th input branch after the h-th round of regulation, that is, the current number, Q CT,(h) It represents the total amount of distributed phase regulators in the new energy station after the hth round of regulation, It represents the voltage stiffness of the ith bar after the hth round of regulation.

[0068]

[0069] The capacity regulation value of the h+1th round is obtained based on the total capacity of the distributed phase-shifting machines of the new energy station after the hth round of regulation, the distributed phase-shifting machines capacity of the ith input branch after the hth round of regulation, the voltage stiffness of the ith input branch after the hth round of regulation, the initial total capacity of the ith input branch, and the target voltage stiffness of the ith input branch.

[0070] That is to say, the capacity regulation value of the h+1th round is directly proportional to the target difference ratio of the voltage stiffness and the ratio of the distributed phase-shifting unit capacity of the ith input branch after the hth round of regulation to the total capacity of the distributed phase-shifting units of the new energy station after the hth round of regulation.

[0071] Step (3): Update and adjust the current capacity and current quantity according to the capacity adjustment value.

[0072] Specifically, after obtaining the capacity adjustment value of the h+1th round, the total capacity of the hth round is adjusted to obtain the total capacity of the i-th input branch of the h+1th round.

[0073] Q Ci,(h+1) N i,(h+1) =Q Ci,h N i,h +ΔQ Ci,h+1

[0074] In some optional implementations, the input branch includes: an input branch to be measured and other input branches, and the step of "calculating the current voltage stiffness under the current capacity and current number" in step 2 includes:

[0075] Step (1): Under the current capacity and current quantity, the self-impedance vectors of the remaining input branches, the grid-connected device impedance vector of the input branch to be measured, the grid-connected device impedance vectors of the remaining input branches and the grid impedance vector are calculated respectively by using the Thevenin equivalent circuit conversion formula;

[0076] Step (2): Calculate the current voltage stiffness based on the self-impedance vectors of the remaining input branches, the grid-connected equipment impedance vector of the input branch to be measured, the grid-connected equipment impedance vectors of the remaining input branches and the grid impedance vector.

[0077] Specifically, through the Thevenin equivalent circuit conversion formula, we can deduce The Thevenin equivalent circuit conversion formula is not described in detail here. i represents the i-th input branch, j represents the remaining input branches, that is, when j ≥ 2, j represents the cumulative value of multiple mutual impedances. Figure 4 , (A) is equivalent to (B). represents the voltage stiffness of multiple input branches, represents the AC bus voltage of the i-th input branch, U i0 represents the no-load voltage of the AC busbar of the i-th input branch, and denote the AC bus no-load voltage vector of the i-th input branch and the AC bus no-load voltage vector of j, respectively. Represents the equivalent impedance vector of multiple input branch power grids, represents the mutual impedance vector between the ith input branch and j, represents the self-impedance vector of j, and They represent the equivalent impedance vector of the grid-connected equipment of the i-th input branch and the equivalent impedance vector of the grid-connected equipment of j, respectively. According to relevant research and actual operation experience, in general,

[0078]

[0079] In some optional implementations, the step of "calculating the current voltage stiffness under the current capacity and the current quantity" in step a1 includes:

[0080] Step (3): Based on the electromagnetic transient simulation model of the new energy station, the transient voltage of the AC bus with multiple DC inputs and the no-load voltage of the AC bus with multiple DC inputs under the current capacity and the current number are obtained;

[0081] Step (4): Based on the ratio of the AC bus voltage of the multi-DC feed-in and the no-load voltage of the AC bus of the multi-DC feed-in, the current voltage stiffness is obtained.

[0082] Specifically, through the electromagnetic transient simulation model of the new energy station, we can obtain and U i0 . That is, the AC bus transient voltage of the i-th input branch, U i0 is the no-load voltage of the AC busbar of the i-th input branch. Optionally, the simulation software may be PSCAD (Power Systems Computer Aided Design, electromagnetic electromagnetic) or Simulink (a visual simulation tool), etc. In the simulation software, a corresponding electromagnetic transient simulation model is built based on the energy absorption station structure, and the no-load voltage value of each AC busbar of each new energy station and the overvoltage value under transient conditions are simulated by simulation, and the overvoltage value under transient conditions is obtained by The voltage stiffness of the i-th bar is calculated by the formula.

[0083] In some optional implementations, the configuration method of the distributed phase condenser further includes:

[0084] Step 1: If the current voltage stiffness is lower than the target voltage stiffness, increase the current capacity and / or current quantity;

[0085] Step 2: If the current voltage stiffness is higher than the target voltage stiffness, reduce the current capacity and / or current quantity.

[0086] Specifically, according to the From the formula, we can know that the main sensitive parameters affecting the voltage stiffness of the input branch include self-impedance, mutual impedance, equipment equivalent impedance and grid equivalent impedance. The voltage stiffness of the input branch is inversely proportional to the grid equivalent impedance and directly proportional to the grid-connected equipment equivalent impedance. In order to evaluate the change trend of the voltage stiffness of multi-DC feed-in to the above self-impedance and mutual impedance, the partial derivatives of the voltage stiffness with respect to the two parameters are derived respectively.

[0087]

[0088] It can be seen that since the partial derivative of the voltage stiffness of the input branch with respect to the self-impedance is always less than zero, the voltage stiffness of the input branch and the self-impedance show a negatively correlated trend.

[0089] According to the partial derivative of the voltage stiffness of the input branch with respect to the mutual impedance, it can be obtained that:

[0090]

[0091] Therefore, the voltage stiffness of the input branch shows a negative correlation with the mutual impedance.

[0092] For the reactive capacity Q absorbed by the AC busbar of the new energy station vi Taking the derivatives of self-impedance and mutual impedance respectively, we can get:

[0093]

[0094] It can be seen that the voltage stiffness is negatively correlated with both the self-impedance and the mutual impedance. Therefore, the voltage stiffness is positively correlated with the reactive capacity emitted or absorbed by the distributed phase regulator.

[0095] Therefore, if the current voltage stiffness is lower than the target voltage stiffness, the current capacity and / or the current quantity is increased. If the current voltage stiffness is higher than the target voltage stiffness, the current capacity and / or the current quantity is decreased.

[0096] In some optional implementations, the step of “confirming the target voltage stiffness of each input branch” in step S101 includes:

[0097] Step 1: Determine the target voltage stiffness based on the actual voltage support requirements of each input branch; and / or,

[0098] Specifically, the optimal capacity of distributed phase regulators is configured according to the voltage stiffness target value set for each input branch, and the maximum overvoltage level of the AC bus is usually taken as 1.3pu.

[0099] Step 2: Confirm the target voltage stiffness based on the voltage tolerance of each input branch.

[0100] Specifically, the target voltage stiffness may also be determined according to the actual voltage tolerance of each input branch.

[0101] refer to Figure 5 According to the actual project planning, determine the number and capacity of new energy converter grid-connected equipment contained in each medium voltage or low voltage (such as 110kV, 220kV or 330kV) new energy station. According to the basic principles and experience of reactive power compensation configuration of new energy stations, configure the initial number and initial capacity of distributed phase shifters at the AC bus of each DC feed. Through the Thevenin equivalent circuit conversion, derive the equivalent impedance of each new energy grid-connected device and the equivalent electromotive force and equivalent impedance of the input branch. Based on the obtained The formula is used to calculate the voltage stiffness of each AC busbar fed by DC in each new energy station. Alternatively, by simulating the no-load voltage value and overvoltage value under transient conditions of each AC busbar in each new energy station, the voltage stiffness of each AC busbar is calculated based on the obtained The formula is used to calculate the voltage stiffness of each AC busbar of each new energy station. When the conditions are met, the distributed phase regulator configuration result is determined to be the optimal configuration capacity of the distributed phase regulators of each new energy station. When the conditions are met, calculate the capacity of the distributed phase regulator that needs to be increased or decreased by the ith multi-DC-fed AC busbar during the h+1th round of regulation, then calculate the capacity of the distributed phase regulator at the ith multi-DC-fed AC busbar after the h+1th round of regulation, and calculate the regulation capacity of the distributed phase regulator at the multi-DC-fed AC busbar of all new energy stations, and return to the result based on the obtained The formula is used to calculate the AC bus voltage stiffness of each DC feed in each new energy station until it meets condition.

[0102] In this embodiment, a distributed phase-shifting device based on voltage stiffness index is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and will not be repeated for what has been described. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0103] This embodiment provides a distributed phase-shifting configuration device based on voltage stiffness index, such as Figure 6 As shown, including:

[0104] The first confirmation module 501 is used to confirm the target voltage stiffness of each input branch, wherein the voltage stiffness is used to indicate the voltage support degree.

[0105] The second confirmation module 502 is used to confirm the target capacity and target number of the distributed phase regulators set in each input branch according to the target voltage stiffness, and obtain the station capacity and station number according to the sum of the target capacity and target number of each input branch.

[0106] The configuration module 503 is used to configure the distributed phase regulators of the new energy stations based on the station capacity and the number of stations, so as to configure the distributed phase regulators according to the target voltage support level.

[0107] In some optional implementations, the second confirmation module 502 includes:

[0108] A first confirmation unit is used to confirm the initial capacity and initial number of distributed phase regulators set in each input branch;

[0109] An updating unit takes the initial capacity and the initial quantity as the current capacity and the current quantity, calculates the current voltage stiffness of the current capacity and the current quantity, iteratively updates the current capacity and the current quantity according to the current voltage stiffness and the target voltage stiffness, until the current voltage stiffness of each input branch meets its respective target voltage stiffness, and obtains the target capacity and target quantity of each input branch, wherein the difference between the updated voltage stiffness corresponding to the target capacity and the target quantity and the target voltage stiffness is less than a preset difference threshold.

[0110] In some optional implementations, the updating unit includes:

[0111] The first calculation subunit is used to calculate the total capacity of all input branches in the new energy station and calculate the current voltage stiffness under the current capacity and current number;

[0112] The second calculation subunit is used to obtain a capacity adjustment value according to the target voltage stiffness, the total capacity, the current capacity, the current quantity and the current voltage stiffness.

[0113] In some optional implementations, the input branch includes: an input branch to be measured and other input branches, and the updating unit further includes:

[0114] The third calculation subunit is used to calculate the self-impedance vectors of the remaining input branches, the grid-connected device impedance vectors of the input branch to be measured, the grid-connected device impedance vectors of the remaining input branches, and the grid impedance vector respectively under the current capacity and current number through the Thevenin equivalent circuit conversion formula;

[0115] The fourth calculation subunit is used to calculate the current voltage stiffness according to the self-impedance vectors of the remaining input branches, the grid-connected equipment impedance vector of the input branch to be measured, the grid-connected equipment impedance vectors of the remaining input branches and the grid impedance vector.

[0116] In some optional implementations, the updating unit includes:

[0117] The simulation subunit is used to obtain the transient voltage of the AC bus with multiple DC inputs and the no-load voltage of the AC bus with multiple DC inputs under the current capacity and current number based on the electromagnetic transient simulation model of the new energy station;

[0118] The fifth calculation subunit is used to obtain the current voltage stiffness based on the ratio of the AC bus voltage of the multi-DC feed-in and the no-load voltage of the AC bus of the multi-DC feed-in.

[0119] In some optional embodiments, the device is also used to increase the current capacity and / or the current quantity if the current voltage stiffness is lower than the target voltage stiffness; if the current voltage stiffness is higher than the target voltage stiffness, reduce the current capacity and / or the current quantity.

[0120] In some optional implementations, the first confirmation module 501 includes:

[0121] a second confirmation unit, confirming the target voltage stiffness according to the actual voltage support requirement of each input branch; and / or,

[0122] The third confirmation unit is used to confirm the target voltage stiffness according to the voltage tolerance of each input branch.

[0123] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0124] The distributed phase-shifting device based on voltage stiffness index in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0125] The embodiment of the present invention also provides a computer device having the above Figure 6 A distributed phase-converter configuration device based on voltage stiffness index is shown.

[0126] See also Figure 7 , Figure 7 Schematic diagram of the hardware structure of the computer device according to the embodiment of the present invention. Figure 7 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 7 A processor 10 is taken as an example.

[0127] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0128] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0129] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0130] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0131] The computer device also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 7 The example of connecting through bus is taken in the following.

[0132] The input device 30 can receive input digital or character information, and generate key signal input related to the user settings and function control of the computer device, such as a touch screen, a keypad, a mouse, a track pad, a touch pad, an indicator bar, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED) and a tactile feedback device (e.g., a vibration motor), etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0133] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0134] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0135] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A distributed phase condenser configuration method based on voltage stiffness index, characterized in that: The distributed phase-converter configuration method based on voltage stiffness index is applied to a new energy station including multiple input branches, and the method comprises: Determining a target voltage stiffness of each input branch, wherein the voltage stiffness is used to indicate a voltage support degree; Determine the target capacity and target number of distributed phase regulators set in each input branch according to the target voltage stiffness, and obtain the station capacity and station number according to the sum of the target capacity and target number of each input branch; The distributed phase regulator of the new energy station is configured based on the station capacity and the number of stations, so as to configure the distributed phase regulator according to the target voltage support degree.

2. The method according to claim 1, characterized in that The step of confirming the target capacity and target number of distributed phase regulators set in each input branch according to the target voltage stiffness includes: Confirm the initial capacity and initial number of distributed phase regulators set in each input branch; The initial capacity and the initial quantity are used as the current capacity and the current quantity, the current voltage stiffness under the current capacity and the current quantity is calculated, and the current capacity and the current quantity are iteratively updated according to the current voltage stiffness and the target voltage stiffness until the current voltage stiffness of each input branch meets its respective target voltage stiffness, and the target capacity and the target quantity of each input branch are obtained, wherein the difference between the updated voltage stiffness corresponding to the target capacity and the target quantity and the target voltage stiffness is less than a preset difference threshold.

3. The method according to claim 2, characterized in that The step of iteratively updating the current capacity and the current quantity according to the current voltage stiffness and the target voltage stiffness comprises: Calculate the total capacity of all input branches in the new energy station; Obtaining a capacity adjustment value according to the target voltage stiffness, the total capacity, the current capacity, the current quantity and the current voltage stiffness; The current capacity and the current quantity are updated and adjusted according to the capacity adjustment value.

4. The method according to claim 2, characterized in that: The input branch includes: an input branch to be measured and other input branches, and the step of calculating the current voltage stiffness under the current capacity and the current number includes: Under the current capacity and the current quantity, the self-impedance vectors of the remaining input branches, the grid-connected device impedance vector of the input branch to be measured, the grid-connected device impedance vectors of the remaining input branches and the grid impedance vector are calculated respectively by using the Thevenin equivalent circuit conversion formula; The current voltage stiffness is calculated according to the self-impedance vectors of the remaining input branches, the grid-connected equipment impedance vectors of the input branch to be measured, the grid-connected equipment impedance vectors of the remaining input branches, and the grid impedance vector.

5. The method according to claim 2, characterized in that: The step of calculating the current voltage stiffness under the current capacity and the current quantity comprises: Based on the electromagnetic transient simulation model of the new energy station, the transient voltage of the AC bus with multiple DC feeds and the no-load voltage of the AC bus with multiple DC feeds under the current capacity and the current number are obtained; The current voltage stiffness is obtained based on the ratio of the AC bus voltage of the multiple DC feeds to the no-load voltage of the AC bus of the multiple DC feeds.

6. The method according to claim 2, characterized in that The method further comprises: If the current voltage stiffness is lower than the target voltage stiffness, increasing the current capacity and / or the current quantity; If the current voltage stiffness is higher than the target voltage stiffness, the current capacity and / or the current quantity is reduced.

7. The method according to claim 1, characterized in that The step of confirming the target voltage stiffness of each input branch includes: Determine the target voltage stiffness based on the actual voltage support requirements of each input branch; and / or, The target voltage stiffness is confirmed according to the voltage tolerance of each input branch.

8. A distributed phase condenser configuration device based on voltage stiffness index, characterized in that: The distributed phase regulator configuration device based on voltage stiffness index includes: A first confirmation module is used to confirm the target voltage stiffness of each input branch, wherein the voltage stiffness is used to indicate the voltage support degree; A second confirmation module is used to confirm the target capacity and target number of distributed phase regulators set in each input branch according to the target voltage stiffness, and obtain the station capacity and the station number according to the sum of the target capacity and the target number of each input branch; A configuration module is used to configure the distributed phase regulator of the new energy station based on the station capacity and the number of stations, so as to configure the distributed phase regulator according to the target voltage support degree.

9. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the distributed phase regulator configuration method based on voltage stiffness index as described in any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the distributed phase condenser configuration method based on voltage stiffness index according to any one of claims 1 to 7.

11. A computer program product, characterized in that It comprises computer instructions, and the computer instructions are used to make a computer execute the distributed phase condenser configuration method based on voltage stiffness index described in any one of claims 1 to 7.

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